package cn.stylefeng.guns.sys.core.util;

import cn.stylefeng.guns.sys.modular.act.core.util.FileUtil;

import javax.servlet.http.HttpServletResponse;
import java.io.BufferedOutputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

/**
 * 下载文件
 *
 * @author fengshuonan
 * @Date 2019/8/7 23:14
 */
public class FileDownload {

	/**
	 * @param response
	 * @param filePath		//文件完整路径(包括文件名和扩展名)
	 * @param fileName		//下载后看到的文件名
	 * @return  文件名
	 */
	public static void fileDownload(final HttpServletResponse response, String filePath, String fileName) throws Exception{
		byte[] data = FileUtil.toByteArray2(filePath);
	    fileName = URLEncoder.encode(fileName, "UTF-8");
	    response.reset();
	    response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
	    response.addHeader("Content-Length", "" + data.length);
	    response.setContentType("application/octet-stream;charset=UTF-8");
	    OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
	    outputStream.write(data);
	    outputStream.flush();
	    outputStream.close();
	    response.flushBuffer();
	}

}
